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subthreshold

[suhb-thresh-ohld, -thresh-hohld] /sʌbˈθrɛʃ oʊld, -ˈθrɛʃ hoʊld/
adjective, Psychology, Physiology.
1.
(of a stimulus) too weak to produce a response.
Origin of subthreshold
1940-1945
1940-45; sub- + threshold
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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